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A random sample of 36 individuals were selected from the batch of products to estimate a...

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Basic Math

A random sample of 36 individuals were selected from the batchof products to estimate a feature of interest. Suppose that thesample mean is 125 and the standard deviation for this batch isassumed to be 24.

a) construct a 95% confidence interval for the mean value forthis feature of the batch.

b) if we want to make the sampling error +/- 7, how many moreindividuals should be selected to achieve a confidence level95%?

c) based on the current sample, how confident can you claim thatthe true value for the mean is between 118 and 132?

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